Does this mean that elected officials like the mayor can act with impunity in Guerrero?

I don't know who or what to believe anymore.

Most elected officials throughout Mexico are immune from prosecution. Those with warrants out for their arrest but who somehow win an election often hide out and then sneak into the swearing-in ceremony. This has happened at local, state and federal levels for decades. To lose their immunity requires some byzantine actions by their state or federal legislature. Recently a few states have voted on proposals to remove that immunity since it is such a popular measure in the fight against corruption and impunity. Guerrero's state legislature is being urged by many groups to reconsider their vote. But then why would criminals vote away one of their best means of protection? Their negativity to accountability pretty much speaks for itself.